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authorManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>2020-03-24 11:40:44 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-03-24 13:45:24 +0100
commit821747386cb6cd75593a8854208b8af188b4caed (patch)
treeefd8c7a53efee176890bfe54e28e924568a54104 /include/linux/mhi.h
parent8622dfefb6ac333c58d354331d1bf78a2927ce51 (diff)
bus: mhi: core: Pass module owner during client driver registration
The module owner field can be used to prevent the removal of kernel modules when there are any device files associated with it opened in userspace. Hence, modify the API to pass module owner field. For convenience, module_mhi_driver() macro is used which takes care of passing the module owner through THIS_MODULE of the module of the driver and also avoiding the use of specifying the default MHI client driver register/unregister routines. Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20200324061050.14845-2-manivannan.sadhasivam@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/mhi.h')
-rw-r--r--include/linux/mhi.h21
1 files changed, 19 insertions, 2 deletions
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 79cb9f898544..d83e7772681b 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -514,11 +514,28 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
*/
void mhi_unregister_controller(struct mhi_controller *mhi_cntrl);
+/*
+ * module_mhi_driver() - Helper macro for drivers that don't do
+ * anything special other than using default mhi_driver_register() and
+ * mhi_driver_unregister(). This eliminates a lot of boilerplate.
+ * Each module may only use this macro once.
+ */
+#define module_mhi_driver(mhi_drv) \
+ module_driver(mhi_drv, mhi_driver_register, \
+ mhi_driver_unregister)
+
+/*
+ * Macro to avoid include chaining to get THIS_MODULE
+ */
+#define mhi_driver_register(mhi_drv) \
+ __mhi_driver_register(mhi_drv, THIS_MODULE)
+
/**
- * mhi_driver_register - Register driver with MHI framework
+ * __mhi_driver_register - Register driver with MHI framework
* @mhi_drv: Driver associated with the device
+ * @owner: The module owner
*/
-int mhi_driver_register(struct mhi_driver *mhi_drv);
+int __mhi_driver_register(struct mhi_driver *mhi_drv, struct module *owner);
/**
* mhi_driver_unregister - Unregister a driver for mhi_devices